Home / Organic Reactions / Baldwin's rules / Classes of cyclization (5-exo-trig)
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The ring being formed has five members; the breaking C=O bond is outside the new ring (exo); the C being attacked is a trigonal (sp2) atom (trig).
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K. Gilmore and I. V. Alabugin, Chem. Rev., 2011, 111, 6513–6556.
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